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</head>

<body class="vscode-body vscode-light">
    <ol>
        <li>写一个函数getDateString()返回当前日期为如下格式</li>
    </ol>
    <pre><code class="language-js"><div><span class="hljs-string">&quot;今天是星期二，现在时间是10:22:31&quot;</span>
</div></code></pre>
    <ol start="2">
        <li>写一个函数triArea(a, b, c)，输入三角形的三条边，返回计算面积。</li>
    </ol>
    <p>已知面积公式为：<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML">
                    <semantics>
                        <mrow>
                            <mi>a</mi>
                            <mi>r</mi>
                            <mi>e</mi>
                            <mi>a</mi>
                            <mo>=</mo>
                            <mroot>
                                <mrow>
                                    <mi>s</mi>
                                    <mo stretchy="false">(</mo>
                                    <mi>s</mi>
                                    <mo>−</mo>
                                    <mi>a</mi>
                                    <mo stretchy="false">)</mo>
                                    <mo stretchy="false">(</mo>
                                    <mi>s</mi>
                                    <mo>−</mo>
                                    <mi>b</mi>
                                    <mo stretchy="false">)</mo>
                                    <mo stretchy="false">(</mo>
                                    <mi>s</mi>
                                    <mo>−</mo>
                                    <mi>c</mi>
                                    <mo stretchy="false">)</mo>
                                </mrow>
                                <mn>2</mn>
                            </mroot>
                        </mrow>
                        <annotation encoding="application/x-tex">area = \sqrt[2]{s(s-a)(s-b)(s-c)}</annotation>
                    </semantics>
                </math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut"
                        style="height:0.4306em;"></span><span class="mord mathnormal">a</span><span
                        class="mord mathnormal">re</span><span class="mord mathnormal">a</span><span class="mspace"
                        style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace"
                        style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut"
                        style="height:1.24em;vertical-align:-0.305em;"></span><span class="mord sqrt"><span
                            class="root"><span class="vlist-t"><span class="vlist-r"><span class="vlist"
                                        style="height:0.7002em;"><span style="top:-2.878em;"><span class="pstrut"
                                                style="height:2.5em;"></span><span
                                                class="sizing reset-size6 size1 mtight"><span class="mord mtight"><span
                                                        class="mord mtight">2</span></span></span></span></span></span></span></span><span
                            class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"
                                    style="height:0.935em;"><span class="svg-align" style="top:-3.2em;"><span
                                            class="pstrut" style="height:3.2em;"></span><span class="mord"
                                            style="padding-left:1em;"><span class="mord mathnormal">s</span><span
                                                class="mopen">(</span><span class="mord mathnormal">s</span><span
                                                class="mspace" style="margin-right:0.2222em;"></span><span
                                                class="mbin">−</span><span class="mspace"
                                                style="margin-right:0.2222em;"></span><span
                                                class="mord mathnormal">a</span><span class="mclose">)</span><span
                                                class="mopen">(</span><span class="mord mathnormal">s</span><span
                                                class="mspace" style="margin-right:0.2222em;"></span><span
                                                class="mbin">−</span><span class="mspace"
                                                style="margin-right:0.2222em;"></span><span
                                                class="mord mathnormal">b</span><span class="mclose">)</span><span
                                                class="mopen">(</span><span class="mord mathnormal">s</span><span
                                                class="mspace" style="margin-right:0.2222em;"></span><span
                                                class="mbin">−</span><span class="mspace"
                                                style="margin-right:0.2222em;"></span><span
                                                class="mord mathnormal">c</span><span
                                                class="mclose">)</span></span></span><span style="top:-2.895em;"><span
                                            class="pstrut" style="height:3.2em;"></span><span class="hide-tail"
                                            style="min-width:1.02em;height:1.28em;"><svg
                                                xmlns="http://www.w3.org/2000/svg" width='400em' height='1.28em'
                                                viewBox='0 0 400000 1296' preserveAspectRatio='xMinYMin slice'>
                                                <path d='M263,681c0.7,0,18,39.7,52,119
c34,79.3,68.167,158.7,102.5,238c34.3,79.3,51.8,119.3,52.5,120
c340,-704.7,510.7,-1060.3,512,-1067
l0 -0
c4.7,-7.3,11,-11,19,-11
H40000v40H1012.3
s-271.3,567,-271.3,567c-38.7,80.7,-84,175,-136,283c-52,108,-89.167,185.3,-111.5,232
c-22.3,46.7,-33.8,70.3,-34.5,71c-4.7,4.7,-12.3,7,-23,7s-12,-1,-12,-1
s-109,-253,-109,-253c-72.7,-168,-109.3,-252,-110,-252c-10.7,8,-22,16.7,-34,26
c-22,17.3,-33.3,26,-34,26s-26,-26,-26,-26s76,-59,76,-59s76,-60,76,-60z
M1001 80h400000v40h-400000z' />
                                            </svg></span></span></span><span class="vlist-s">​</span></span><span
                                class="vlist-r"><span class="vlist"
                                    style="height:0.305em;"><span></span></span></span></span></span></span></span></span>
        且 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML">
                    <semantics>
                        <mrow>
                            <mi>s</mi>
                            <mo>=</mo>
                            <mfrac>
                                <mrow>
                                    <mi>a</mi>
                                    <mo>+</mo>
                                    <mi>b</mi>
                                    <mo>+</mo>
                                    <mi>c</mi>
                                </mrow>
                                <mn>2</mn>
                            </mfrac>
                        </mrow>
                        <annotation encoding="application/x-tex">s=\frac{a+b+c}{2}</annotation>
                    </semantics>
                </math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut"
                        style="height:0.4306em;"></span><span class="mord mathnormal">s</span><span class="mspace"
                        style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace"
                        style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut"
                        style="height:1.2251em;vertical-align:-0.345em;"></span><span class="mord"><span
                            class="mopen nulldelimiter"></span><span class="mfrac"><span class="vlist-t vlist-t2"><span
                                    class="vlist-r"><span class="vlist" style="height:0.8801em;"><span
                                            style="top:-2.655em;"><span class="pstrut" style="height:3em;"></span><span
                                                class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span
                                                        class="mord mtight">2</span></span></span></span><span
                                            style="top:-3.23em;"><span class="pstrut" style="height:3em;"></span><span
                                                class="frac-line"
                                                style="border-bottom-width:0.04em;"></span></span><span
                                            style="top:-3.394em;"><span class="pstrut" style="height:3em;"></span><span
                                                class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span
                                                        class="mord mathnormal mtight">a</span><span
                                                        class="mbin mtight">+</span><span
                                                        class="mord mathnormal mtight">b</span><span
                                                        class="mbin mtight">+</span><span
                                                        class="mord mathnormal mtight">c</span></span></span></span></span><span
                                        class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist"
                                        style="height:0.345em;"><span></span></span></span></span></span><span
                            class="mclose nulldelimiter"></span></span></span></span></span></p>
    <ol start="3">
        <li>写一个函数，判断输入的年数是否是闰年，闰年判断公式为</li>
    </ol>
    <p><img src="https://tva1.sinaimg.cn/large/e6c9d24egy1h16v5tfaegj20qo0l4myc.jpg" alt=""></p>
    <ol start="4">
        <li>
            <p>写一个效果，每隔一段时间把一个字符串的最后一个字符放到最开头的位置，比如&quot;Hello world&quot; -&gt; &quot;dHello worl&quot; -&gt;
                &quot;ldHello wor&quot;...一直这样下去。</p>
            <p><img src="https://tva1.sinaimg.cn/large/008i3skNly1gsahzu0877g305k01oq30.gif" alt=""></p>
            <pre><code class="language-html"><div><span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&#x27;c&#x27;</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">script</span>&gt;</span><span class="javascript">
<span class="hljs-keyword">let</span> c = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&#x27;c&#x27;</span>)
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">loopWord</span>(<span class="hljs-params">word</span>) </span>{
  <span class="hljs-comment">// 提示：用setInterval</span>
}
loopWord(<span class="hljs-string">&#x27;hello world.&#x27;</span>)
</span><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span>

</div></code></pre>
        </li>
        <li>
            <p>找出所有2021-2100之间所有1月1日为星期日的日子并作为数组返回这些年，比如[&quot;2023&quot;, &quot;2034&quot;, &quot;2040&quot;...]。<a
                    href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Date">参考Date对象文档</a>
            </p>
        </li>
    </ol>
    <div id="c"></div>
    <script>
        //1.写一个函数getDateString()返回当前日期为如下格式,今天是星期二，现在时间是10:22:31
        function getDateString() {
            let myDate = new Date()
            let hour = myDate.getHours(); //获取系统时， 
            let min = myDate.getMinutes(); //分 
            let sec = myDate.getSeconds(); //秒
            hour < 10 && (hour = "0" + hour);
            min < 10 && (min = "0" + min);
            sec < 10 && (sec = "0" + sec);
            let str = `${"今天是星期" + '日一二三四五六'.charAt(myDate.getDay())},现在时间是：${hour}:${min}:${sec}`
            return str
        }

        //2.写一个函数triArea(a, b, c)，输入三角形的三条边，返回计算面积。
        function triArea(a, b, c) {
            let s = (a + b + c) / 2
            let area = Math.sqrt(s * ((s - a) * (s - b) * (s - c)))
            return area
        }

        //3.写一个函数，判断输入的年数是否是闰年，闰年判断公式为
        function year(num) {
            if (num % 4 === 0 && n % 100 !== 0 || num % 400 === 0) {
                return `公元${num}是闰年`
            }
            return `公元${num}是平年，不是闰年`
        }


        //4.写一个效果，每隔一段时间把一个字符串的最后一个字符放到最开头的位置
        let c = document.getElementById('c')

        function loopWord(word) {

            let i = 0
            setInterval(() => {
                const w = word.slice(i % word.length)
                    + word.slice(0, i % word.length)
                c.innerText = w
                i++
            }, 100)
        }
        loopWord('hello world')







            // function loopWord(word) {

            //     let str = word
            //     setInterval(() => {
            //         str = str.slice(str.length - 1) + str.slice(0, str.length - 1)
            //         console.log(str);
            //     }, 3000)
            // }
            // loopWord('hello world')


            //5.找出所有2021-2100之间所有1月1日为星期日的日子并作为数组返回这些年
            ;

        function newYear(min, max) {
            let arr = []
            for (let i = min; i <= max; i++) {
                let data = new Date(`${i}`)
                let day = data.getDay()
                // console.log(day);
                if (day === 0) {
                    arr.push(i)
                    // console.log(i);
                }
            }
            return arr
            // console.log(arr);
        }
        newYear(2021, 2100)
    </script>
</body>

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